import Vue from "vue";

// v-dialogDrag: 弹窗拖拽
Vue.directive("dialog-drag", {
  // eslint-disable-next-line no-unused-vars
  bind(el, binding, vnode, oldVnode) {
    const dialogHeaderEl = el.querySelector(".el-dialog__header");
    const dragDom = el.querySelector(".el-dialog");
    dialogHeaderEl.style.cursor = "move";

    // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
    const sty = dragDom.currentStyle || window.getComputedStyle(dragDom, null);

    dialogHeaderEl.onmousedown = e => {
      // 鼠标按下，计算当前元素距离可视区的距离
      const disX = e.clientX - dialogHeaderEl.offsetLeft;
      const disY = e.clientY - dialogHeaderEl.offsetTop;

      // 获取到的值带px 正则匹配替换
      let styL, styT;

      // 注意在ie中 第一次获取到的值为组件自带50% 移动之后赋值为px
      if (sty.left.includes("%")) {
        styL =
          // eslint-disable-next-line no-useless-escape
          +document.body.clientWidth * (+sty.left.replace(/\%/g, "") / 100);
        styT =
          // eslint-disable-next-line no-useless-escape
          +document.body.clientHeight * (+sty.top.replace(/\%/g, "") / 100);
      } else {
        styL = +sty.left.replace(/\px/g, "");
        styT = +sty.top.replace(/\px/g, "");
      }

      document.onmousemove = function(e) {
        // 通过事件委托，计算移动的距离
        const l = e.clientX - disX;
        const t = e.clientY - disY;

        // 移动当前元素
        dragDom.style.left = `${l + styL}px`;
        dragDom.style.top = `${t + styT}px`;

        // 将此时的位置传出去
        // binding.value({x:e.pageX,y:e.pageY})
      };

      // eslint-disable-next-line no-unused-vars
      document.onmouseup = function(e) {
        document.onmousemove = null;
        document.onmouseup = null;
      };
    };
  }
});
